Been to China a few times with work, Hong Kong too. I have only seen the industrial part of China where our business is and it's pretty grim, but I'm confident a tourist trip will be much better!
Hong Kong is really cool - get the train from the airport into HK - takes about 30 mins, you can get the ferry across to the party side aswell but I was heavily drinking so can't remember that much, there is a really nice hotel bar called the Darkside at the Rosewood, which had good views from the terrace.
We went here which was really good
https://www.ozonebarhongkong.com/